diff options
Diffstat (limited to 'src/backend/utils/error/elog.c')
| -rw-r--r-- | src/backend/utils/error/elog.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c index e4b717c79a9..2db3e32cb8f 100644 --- a/src/backend/utils/error/elog.c +++ b/src/backend/utils/error/elog.c @@ -3458,6 +3458,34 @@ write_stderr(const char *fmt,...) /* + * Write a message to STDERR using only async-signal-safe functions. This can + * be used to safely emit a message from a signal handler. + * + * TODO: It is likely possible to safely do a limited amount of string + * interpolation (e.g., %s and %d), but that is not presently supported. + */ +void +write_stderr_signal_safe(const char *str) +{ + int nwritten = 0; + int ntotal = strlen(str); + + while (nwritten < ntotal) + { + int rc; + + rc = write(STDERR_FILENO, str + nwritten, ntotal - nwritten); + + /* Just give up on error. There isn't much else we can do. */ + if (rc == -1) + return; + + nwritten += rc; + } +} + + +/* * is_log_level_output -- is elevel logically >= log_min_level? * * We use this for tests that should consider LOG to sort out-of-order, |